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West Elk Mine <br />location, the site for the new gage will be reviewed with the CDMG. <br />Due to the storage in Minnesota Reservoir, the Dry Fork flows at the lower gage do not correlate <br />well with those measured at the upper gage. Consequently, MCC attempted to locate an <br />appropriate gaging location immediately upstream of the reservoir. However, the channel is not <br />well-defined in this reach and a suitable location was not found until reaching the Minnesota <br />Canal and Reservoir Company's Parshall flume (see Map 34). MCC retrofitted the flume with a <br />continuous recorder and added this station to the monitoring program as part of Technical <br />Revision No. 88 in 1999. <br />Flow in the North Fork is measured by a USGS gage near Somerset (09132500). The gage is <br />located immediately upstream of the West Elk Mine site (see Map 34). <br />A Parshall flume will be installed on Deep Creek Ditch just upstream of where the ditch dumps <br />water into the headwaters of Dry Fork (Map 34). The flume will be equipped with a continuous <br />recorder that will operate during the irrigation season, when the ditch carries water from Little <br />Gunnison Creek. Monitoring will be initiated at least one year prior to longwall mining in the <br />South of Divide permit revision area in accordance with Table 10. <br />MCC will monitor flows within the Deer Creek and Poison Gulch channels beginning at least <br />one year prior to the initiation of longwall mining in accordance with Table 10. As these are <br />ephemeral streams, MCC will obtain flow measurements using portable measuring devices when <br />flow is present. Visual estimates will be made when flows are clearly Less than one cubic foot <br />per second. <br />Copies of all raw and processed data from the gaging stations aze maintained on file at MCC's <br />offices for public inspection during normal business hours. Annual reports for the stream gaging <br />stations are furnished to the CDMG in the Annual Hydrology Reports. These reports include <br />monthly measurements of streamflows for each gaging station with maximum, minimum and <br />mean flows reported. A substantial streamflow database now exists. Representative streamflow <br />records are contained in Exhibit 18A. <br />• <br />2.04-86 Revised November 2004 PRIO <br />